The terms of the leases are stipulated upon signing. The lease back return dates come and go regardless of Jetblue profit margins. If the lessor is willing to adjust the terms for the lessee than Jetblue does resign the agreement.

Typically the lease agreements are based on a specific time frame, incorporate cycles and total time on the airframe but rarely are based on profit margins. Upon reaching the end of an agreement Jetblue has resigned based on the lessors desire to maintain similar or better terms.

Again, the agreements are rarely based on Jetblue profit margins. Sorry for the confusion.